Paper-cutting mechanism



w. F. MORSE. PAPER CUTTING MECHANISM.

APPLICATION FILED SEPT-28, 1920 Patentefi Aug; 1, 1922.

3 SHEETS-SHEET llllllllllmmnnm M v ATTORNEY W. F. MORSE.

PAPER CUTTING MECHANISM. APPLICATION FILED SEPT-28, 1920.

Patentefl Aug. 11, 1922;

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IO! J.------ I NV EN TOR. MY/[am F? Marse BY vgk ATTORNEY- W. F. MORSE.

PAPER CUTTING MEQHANISM. APPUCATION FILEDSEPT. 28, 1920.

' PatehtedAugJL 1922.

3 S'HEETS'SHEET 3.

lJLlL INVENTOR.

WILLIAM F. MORSE, 0F ROGL'IES'IEB, NEW YORK, ASSIGNOR- T0 SAMUEL It. PARRY, OF ROCHESTER, NEW YORK.

PAPER-CUTTING MECHANISM.

Original application filed June 29, 1918, Serial No. 242,648.

Specification of Letters Patent.

Patented Aug. 1, 1922.

Divided and this application filed September 28, 1920. Serial No. 413,400.

Rochester, in the county of Monroe and State of New York, have invented certain,

new and useful Improvements in Paper-Cutting Mechanisms, of which the following is a specification.

The object of this invention is to provide a paper cutting mechanism intended more especially for use in connection with chines for coveringpaper boxes, although it can be used for other purposes as well.

This and other objects of this invention will be fully illustrated in the drawings, described in the specification and pointed out in the claims at the end thereof. 1

In the drawings, v

Fig. 1 is a side elevation of a box covering machine, embodying my invention.

Fig. 2 is an enlarged detail view of the cutting mechanism shown in side elevation.

Fig. 3 is a perspectiveview of the cutting knife and ledger blade, the planes of the two knives being outlined by vertical and horizontal shade lines.

Fig. 1 is a vertical section of the machine, the section being taken on the line lli- 1X of Fig. 1, the cutting mechanism being shown in end elevation.

In the drawings, like reference numerals indicate like parts.

This application is a divisional application of my prior application No. 242,648, filed June 29, 1918.

In the drawings, the reference numeral 30 indicates a shaft having a cam 87. On the frame of the machine is mounted a spindle 89. Mounted to rock on this spindle is the bell crank 90, the lower arm of which engages the cam 87 and is rocked thereby. The bell crank is held in engagement with the cam by the spring 91. On the end of the upper arm of the bell crank is provided a boss 92 through which passes the stud 93, which stud is integral with the split block 9%. Through this split block passes a link 95, the link being clamped on the block by the screw and hand wheel 96. At the upper end the link 95 is connected to the crank 97, which crank is clamped on the shaft 98, which shaft carries a swinging arm 99 provided on its outer end with a cutting knife 100, This cutting knife works against the cutting blade 101, which is mounted on a, bracket 102, pivoted at 103 to the stationary bracket 104:, which bracket is carried on a bar 111, mounted to slide in a grooved head on the stem 105, which stem is adjustable up and down and can be clamped in place by a hand wheel 106. The bracket 102 is held in the forward position shown in Fig.2 by

means of the spring 107 coiled around a pin 108. The rear end of the spring bears against a flange 109 on the bracket 104. The forward end of the spring bears against a jam nut threaded on the pin 108. The other end of the pin extends through the bracket 102 and has a round head thereon with which it engages the bracket. This head is provided with a slot which permits the pin to be turned by a screw driver.

The knives 100 and 101 are set with reference to each other so as to make a double shear, cutting the web of paper substantially at right angles to its length. As the knife 100 swings up, the knife 101 can yield a little so as to adjust itself to the knife 100 and make firmer contact therewith.

The side of the cutting knife 100 toward the ledger blade 101 is ground cylindrical. The cutting edge of the cutting knife is at an angle to the axis of the cylindrical surface and follows a spiral line on the cylindrical surface. The blades or planes of the knives 100 and 101 come together at sub stantially right angles to each other. The cutting knife 100 is set with its edge at a considerable angle tothe plane of the ledger blade. This is necessary in order to secure good shearing action. The ledger blade is set with its edge at a smaller angle to the plane of the cutting knife. This angle is only so much as may be necessary to move the ledger blade far enough so that the contact between the knives is confined to the point where their edges cross each other in their shearing action. The angle which the edge of the blade 101 makes with the plane of the knife 100 is sufiicient to push the knife 101 back faster than the bevel of the knife 100 approaches the edge of the knife 101 as the knife 100 moves up and down and comes into contact with the edge of the knife 101. This keeps the knives apart except at the point where the edges cross each other and there the knives will operate both to shear the paper and sharpen each other. The

to make contact with the knife 101.

paper passes under the ledger blade 101 and the glued surface of the paper is underneath and only the edge of the knife 100 comes into 1 contact with the glued surface and there is,

therefore, little chance of fouling the edges of the knives in consequence.

The relative position of the two knives when they first come together for the purpose of cutting, is shown in Fig. 3. In this figure the knife 100 is shown just beginning The planes of the two knives are shown in section lines. The section lines indicating the plane of the knife 100, intersect triangular shaped portion of the knife 101, the apex of which triangle is at the right hand corner and the base of the triangle is at the left of theknife 101 in Fig. 3; The edge of the knife 101 is the hypotenuse of the triangle. i 20 The plane of the knife 101 projected makes contact with the upper right hand corner of the knife 100 and passes above the upper left hand corner of the knife 100, leavinga substantially triangular space between the plane and the edge of the knife, the point of which trianagular space is at the right of the knife 100. and thebase of the triangualr space is at the left of the knife 100. The edge of the knife 100 is the hypotenuse of thetriangular space refered to. It will be seen from this figure that when the cutting edges of the two knives are together at the right, the left hand edge of the knife 101 projects over the knife 100 and the. left hand end of the knife 100 stands at some distance below the plane of the knife 101 and does not make contact knives will be reversed after the cutting operation has been completed. The edges of the knives 100 and 101 will be in contact at the left and will be separated from each other at the right, the right hand edge of the knife 100 extending above the plane of the knife 101.

I claim:

1. In a box covering machine, the combination of a shear having a cutting knife with the back thereof rounded off at the top, a ledger blade set at substantially right angles to the cutting knife, each of said knives having an inclined edge so as to give a moving point of contact with each other, and the ledger blade being mounted to swing rearwardly'as the cutting blade moves in contact therewith. i

2. In a cutting apparatus for a paper covering machine comprising an upwardly swinging arm, a cutting blade mounted on theend of said arm, said cutting blade having a beveled cutting edge formed. on the upper end thereof, and having a curved back on the outside thereof, said cutting edge be ing inclined upwardly from one end to the other end thereof, a horizontally swinging ledger blade having a beveled cutting edge on the outer end thereof, said beveled edge being receding, the high point of said cut ting blade operating to first engage the short edge of said ledger blade and operating. to gradually move the low point of said cutting blade in contact with the long edge of said ledger blade.

In testimony whereof I alfi-x'my signature.

WILLIAM F. MORSE. 

